Jurgen Klopp is ready to go to war with the FA after complaining they are fools to treat his players like “horses”.

The new Liverpool manager is furious that his promising young star Jordan Rossiter was forced to play three games in five days while on England duty... and picked up a serious hamstring injury in the process.

The teenager, who has been identified as a potential first team player by the German, appeared against Macedonia, Finland and then Italy, even though Aidy Boothroyd’s Under-19s had already progressed to the next stage of the European Championship.

“These young players are our future, if we handle them like horses then we get horses,” he said bluntly.

“It is too much. For sure this is not okay, that is all I say. There is no doubt it is not okay. What can we say? Three games in five days, football is 90 minutes.

"There are special things you have to use, your muscles and if you’re young maybe you are more resistant from things from outside but it is not normal to have three matches in five days and send him back. I have to talk to somebody.

“It is the hamstring, a muscle problem, and where is that coming from? In the last game.

“I don’t know what minute, maybe he played through and then he came back. It was not on the flight, it was not on the train, it was not in the car. It was in the match and because of the match.

“We are in contact, our doctor Andy [Massey] and Chris [Morgan, head of physiotherapy] are talking. I didn’t want my first day at Melwood to be on a call with someone from the FA.”

The FA have revealed Boothroyd has already spoken twice to Liverpool’s medical team, and is keen to speak with Klopp himself to explain the situation.

But the German will not be brushed off easily.

Sidelined: Joe Gomez is set to miss the rest of the campaign (Image: Julian Finney/Getty)

He was angry that Gomez was sent back with a cruciate knee ligament injury, without a clear diagnosis from the FA, and he said: “We want that they improve and that they get better. We want them to have time and not feel too much pressure. They don’t have to play three games in five days.

“That is all I want to say. It is interesting that I have to say this again. Is it normal in England that you have to play three games in five days?

“I don’t think he [Rossiter] is ready to play until after the next international break. I don’t know who I have to speak to about this, but I will find a way of talking to someone. It is not okay. Three matches and five days is the reason why he is now injured.

“We need him in this moment — a young player with a big talent. It would have been good for him if he could be with us, but he can’t. It is too much.

“Rossiter is a special story, I would say. I have never heard that a player that young plays three games in five days.

“That was the problem - why he got injured. Now he is injured and we have to wait for him."

There was at least some good news for Liverpool with Daniel Sturridge, Christian Benteke and Roberto Firmino all returning to training on Wednesday, though Klopp may decide to keep them for Sunday and the important Premier League showdown with Southampton.